Shuffle a vector of repeated numbers so the numbers do not repeat

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Yue Zhang 2016-8-15

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回答： Image Analyst 2016-8-15

Hi,

I have a vector fam1_1 = [1,1,1,2,2,2,3,3,3,4,4,4] that I need shuffled without having any numbers be repeated. Does anyone have any suggestions on how to do this?

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Image Analyst 2016-8-15

In general this is not possible. It's possible for that specific vector, but not in general for any arbitrary vector. For example if fam1_1 were equal to [1,1,1,2,2,1,1,1,1,1,1] it would not be possible to shuffle without repeating a 1. Just want to make sure you realize that.

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Azzi Abdelmalek 2016-8-15

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https://ww2.mathworks.cn/matlabcentral/answers/299692-shuffle-a-vector-of-repeated-numbers-so-the-numbers-do-not-repeat#answer_231830

编辑：Azzi Abdelmalek 2016-8-15

在 MATLAB Online 中打开

Edit

fam1_1 = [1,1,1,2,2,2,3,3,3,4,4,4] 
ii=unique(fam1_1)
n=numel(fam1_1)
m=numel(ii)
p=numel(fam1_1)/numel(ii)
x=ii(randperm(m))
out=x
for k=2:p
  y=setdiff(ii,x(end))    
  y1=y(randi(m-1))
  y2=setdiff(ii,y1)
  x=[y1 y2(randperm(m-1))]
  out=[out x]
end

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Azzi Abdelmalek 2016-8-15

Look at the edited answer

Yue Zhang 2016-8-15

that works! thank you very much :)

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Image Analyst 2016-8-15

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https://ww2.mathworks.cn/matlabcentral/answers/299692-shuffle-a-vector-of-repeated-numbers-so-the-numbers-do-not-repeat#answer_231846

在 MATLAB Online 中打开

Like I said above, in general it's not possible, but it might be able to be solved for a particular sample. For the sample you gave, here's one solution that solves it in just 2 simple lines of code.:

fam1_1 = [1,1,1,2,2,2,3,3,3,4,4,4] % Original data
temp = reshape(fam1_1, [], 4)' % Reshape into 2D matrix
fam1_1 = temp(:)'  % Turn into column vector then transpose into row vector like the original.